Precalc

Precalc takes you from algebra-level foundations to calculus readiness. Built for students who memorize formulas without understanding them, then forget both.

Twelve chapters cover the full precalculus curriculum:

Chapter P. Prerequisites. Real numbers, exponents, radicals, polynomials, factoring, rational expressions.
Chapter 1. Functions. Domain, range, transformations, composition.
Chapter 2. Polynomial and Rational Functions. Behavior, zeros, asymptotes.
Chapter 3. Exponential and Logarithmic Functions. Growth, decay, change of base.
Chapter 4. Trigonometry. Right triangles, the unit circle, identities, graphs.
Chapter 5. Analytic Trigonometry. Inverse functions, equations, complex applications.
Chapter 6. Additional Topics in Trigonometry. Vectors, polar coordinates.
Chapter 7. Systems of Equations. Linear, nonlinear, matrix methods.
Chapter 8. Conic Sections. Parabolas, ellipses, hyperbolas.
Chapter 9. Sequences, Series, and Probability. Arithmetic, geometric, induction.
Chapter 10. Limits and an Introduction to Calculus. The handoff into the next course.
Chapter 11. Final review.

What is different about Precalc

Step-by-step reasoning. Every worked example shows the path, not just the answer. The "why this step" appears next to the math, so you build the mental model instead of memorizing patterns.

On-device only. No account required. No data leaves your phone. No advertisements. Your study progress lives locally and stays yours.

Diagram-first design. Each chapter is built around diagrams sized for a phone screen, not scaled-down textbook figures. You can read the math while walking, on the bus, or at a desk.

Mobile-first practice. Worked examples followed by practice problems. Solutions on tap. Designed for thumb-sized interactions, not pinch and zoom.

Who Precalc is for

Students preparing for calculus who used Khan Academy or YouTube and want a more structured curriculum.

Students who tried a textbook and want guided derivations they can carry on a phone.

Adult learners returning to math after years away.

Homeschool families looking for a self-paced precalculus track that does not require a subscription.

What Precalc is not

Not a quiz app. Not a flashcard deck. Not a video course. Not a paid subscription. Not an account-gated platform.

Precalc is a self-contained reference and practice tool. You open it, work the math, close it. Repeat for twelve chapters and you are ready for Calculus 1.

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